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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
Isometric Shoulder Flexion â Doing this exercise will target the muscles on the front of the shoulders. Stand and face a wall, placing your feet hip-width apart. Put your arms straight at your sides.